Synodica V (Chambésy - Genève, Les Editions du Centre Orthodoxe, 1981) referenced by the Aleppo Statement,
Towards a Common Date of Easter (TCDE), is entirely devoted to the calendar issue on a number of levels, not just the technical, astronomical. It is available as a pdf-download, 3.8MB,
SYNODHIKA_5.pdf [
google.com]. It reveals that consideration was given to adoption of the Gregorian Calendar, and TCDE2025 should reexamine and reevaluate this option. It seems there is very little if any initiative by the Catholic Church in advocating the calendar and Paschalion that it initiated. To the extent this is so it is very unfortunate: the inability or unwillingness of the Catholic Church to offer a real service to the truth by standing up for and presenting the advantages and legitimacy of the Gregorian reform of 1582 and its calendar and Paschalion. The journey begun at Nicaea in 325 could properly, that is in the spirit and details of the Nicaean norm accepted by all, end with the adoption of the Gregorian Paschalion in 2025. This is not just idle talk, hyperbole, triumphalism or flamboyant rhetoric. It is eminently defendable and the Catholic Church should be taken to task for not advocating the Gregorian approach on its own merits, at least for the present and some considerable future time. The study
Proceedings of the Vatican Conference to commemorate its 400th Anniversary, 1582-1982 [
casinapioiv.va] should have a prominent place in the deliberations of TCDE2025.